1864868189 has 2 divisors, whose sum is σ = 1864868190. Its totient is φ = 1864868188.

The previous prime is 1864868119. The next prime is 1864868263. The reversal of 1864868189 is 9818684681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1275204100 + 589664089 = 35710^2 + 24283^2 .

It is a cyclic number.

It is not a de Polignac number, because 1864868189 - 2¹² = 1864864093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1864868119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 932434094 + 932434095.

It is an arithmetic number, because the mean of its divisors is an integer number (932434095).

Almost surely, 2^1864868189 is an apocalyptic number.

It is an amenable number.

1864868189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1864868189 is an equidigital number, since it uses as much as digits as its factorization.

1864868189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5308416, while the sum is 59.

The square root of 1864868189 is about 43184.1196390525. The cubic root of 1864868189 is about 1230.8809405048.

The spelling of 1864868189 in words is "one billion, eight hundred sixty-four million, eight hundred sixty-eight thousand, one hundred eighty-nine".